Malicious PDF — malware analysis report

Static analysis result for SHA-256 06fbd54571ebfd0b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 10:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3978020530b0edfc3b7e886cf76176f2 SHA-1: 770cf016c79efbd9ef5e1bcf22db36cea320701a SHA-256: 06fbd54571ebfd0b6160294551c9c3e32210e81a2bded4d960f2df9ab08bafa5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sicompk.com/survey/userfiles/files/xemevefegorovisatakiso.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d680d11c3---kufexamokukigawafuz.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/27401168661.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/rumixememulavipasuvutage.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/xekadajeletik.pdfIn PDF document text
    • https://g-mtcc.com/motakamel/Ups/files/25864922769.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/58403887155.pdfIn PDF document text
    • http://medi-sen.com/files/files/34294785415.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/12141312269.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/48448836895.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/wetem.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/27652588955.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614638214a6ce---81838087617.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///18630834056.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/vasenumixudugo.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/20851787551.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/jedozabinevona.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/tenitafanelaziju.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/kowok.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/wapironejiluwe.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109200916562005.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613818d7001c1---94208802500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=manage+passwords+on+my+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB066 17760 bytes
SHA-256: 9e5ed0d2347412b9e13dcddd0b45609a4fff89d1e3853ae505bc3c5fff164739
font_01_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 10796 bytes
SHA-256: f08279be0eb0e09087fcdb2c4ba965459bf9d8fee3f4f402467a6e7b67ecd97e
font_02_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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